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The steel cylinder-lined V8 engine is capable of doing 0-60mph in 6.9 seconds and a top speed of 149mph, a useful turn of speed for a royal emergency.

The five-seater was specified without a rear cigar lighter or ashtrays, apparently due to Her Majesty’s aversion to smoking.

And where the front ashtray would be, there are controls for a full suite of security lights, including convoy lights either side of the rear view mirror to make Her Majesty’s presence immediately apparent to her security team at times of poor visibility.

The space for a CD changer was taken up by equipment for keeping the Queen in touch with the Home Office and government.